package com.ryan.member.mapper;

import com.ryan.member.entity.Member;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;

/**
 * <p>
 * 会员表 Mapper 接口
 * </p>
 *
 * @author ryan
 * @since 2020-07-29
 */
public interface MemberMapper extends BaseMapper<Member> {

    /**
     * 统计某个时间的注册人数
     * @param day
     * @return
     */
    Integer countRegister(String day);
}
